Effects of La on As-cast Microstructure and Properties of Sr Modified A356 Alloy
Effects of different Sr and La contents on as-cast microstructure and mechanical properties of A356 alumi-num alloy were investigated.A356 aluminum alloy was melted in electric furnace,and the as-cast microstructure and fracture morphologies were characterized by XRD,metallographic microscopy,and scanning electron microscopy,meanwhile mechanical properties were analyzed.The results indicate that the combination addition of Sr+La can effec-tively refine as-cast structure of A356 aluminum alloy,achieving the improvement of mechanical properties,and the optimal refinement and modification are realized with 0.05％Sr+0.3％La addition.However,when the amount of La exceeds 0.5％,coarsened La-rich phases appear,which is harmful to mechanical properties.
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